Improvement in pitivian-comnectio



C. M. YOUNG'. Pitman-Connections.

Patented Nov. H0, 1874.`

UNITED STATns Erica.

CHARLES M. YOUNG, OF MEADVILLE, PNNSYLVANIA.

IMPROVEMENT IN PITWlAN-CONNECTIONS.

Specification forming part of Letters Patent No. 156,689, dated November10, i374; application filed September 21, 1874. .5'

To all whom 'it may concern:

Be it known that I, CHARLES M. YOUNG, of Meadville, county of Crawford,State of Pennsylvania, have invented certain new and useful Improvementsin Pitman-Connections, of which the following is a full, clear, andexact description, reference being had to the accompanying drawing,making part of this specication, in which- Figure l is a perspectiveview of my improved pitman-connection, represented as applied to thehead of a sickle-bar of a harvest ing-machine. Fig. 2 is a verticaltransverse section through the same. Fig. 3 is avertical section on theline x m, Fig. 2; and Fig. 4 shows perspective views of the bolt,spring, wave-Washer, and nut detached.

Similar letters of reference denote corresponding parts wherever used.

The invention relates to that class of pitmen more especially adaptedfor use in harvestingmachines for driving the sicklebar, and will bedescribedwith reference to such application, though it will be apparentfrom the construction hereinafter described that it may be applied withadvantage to other classes of machinery.

The invention consists in providing the pitman end with a hollowsemi-spherical cup, adapted to it a correspondingly-shaped wrist or pinformed on the sickle head, or other device to which the pitman is to beapplied, said wrist being made also in cup or hollow hemispherical form,and adapted to inclose and confine a spring and wave-washer, and allunited by a through-bolt and wave or lock nut, as hereinafter fully setforth.

The object of this construction will be understood from the followingdescription with reference to the drawings, in which- A represents thesickle-bar or other device to which the pitman is to be applied. Uponthe end of this bar, to which the pitman is to be connected, is formedan upright, a c', terminating in a hollow cylindrical head, B, which atone end is closed, except a through perforation for a bolt, by aconcavoconvex web, b, the convex face being outward, as shown in Fig. 2.At the junction of this hemispherical end b with the cylinder B agroove, b', is cut in the periphery of the head, which facilitates theoiling of the pitman-joint, and also serves the pitm an on its j oint,as hereinafter explained. rlhe pitman represented at C is provided onits end with a hollow helnispherical cup, C', conforming on its innerconcave face to the outer convex face of the end b of the head B, andfitting snugly thereon. Within the hollow cupshaped head B is placed arubber spring, D; or it may, if preferred, be a helical metal springsurrounding the through-bolt E, and adjoining this spring, and alsowithin, or partly within and inclosed by, the cylindrical head B is awave-washer, F, provided on its inner face with wave projections orspurs f, which match in or form corresponding V-sliaped cavities d inthe adjacent face of the rubber spring D. The bolt E has a longitudinalgroove formed or cut upon one side at c, said groove matching a spur orrib, c', formed at one side of the bolt-hole through the head B, therebyfeatherin g the bolt to the head, and preventing it from turning, butpermitting a free end movement of the bolt, and the inner face of thehead E is made concave (though this is not essential) to match theconcave face of the pitman-cup C', as shown in Fig. 2, for facilitatingthe rocking or rolling of said pitman upon the sickle-head, to avoidcramping of the parts, and the bolt thus formed passes through thepitman-head C', sickle-head B, spring D, wave-washer F, and is securedin place by the nut G, the inner face of which is provided with waveprojections g, which engage with corresponding depressions f :in theadjacent face of the wave-washer F, which, in connection with the springD and the feathering of the bolt to the sickle-head, serve effectuallyto lock the nut, and to prevent any rotation of the holt, washer, andnut relatively to the head B. The bolt perforation at c, through thepitman end C, is enlarged sufficiently to allow any required vibrationof the sickle-head and pitman relatively to each other on theirlongitudinal axes, to prevent cramping, and to permit the changing ofthe angie of presentation of the cutters, while the spring D serves tokeep the pitman-head C at all times closely drawn upon its pivotalbearingb, thereby compensating for wear, preventing the parts frombecoming loose, and obviating the objectionable rattling or poundingcommon to pitmen as ordinarily constructed in this class of machinesafter brief use. Another advantage of this construction is, that thespring D is confined, and thereby prevented from expanding, andconsequent rapid deterioration in strength, while at the same time it isprotected from the weather, which in outof-do'or machinery speedilyeii'ects the destruction of rubber springs exposed thereto, and hence agreatly-increased durability is secured.

I am aware that a hemispherical joint is not new in pitman-connections,and that springs have been used between the sickle-head and pitman forkeeping these parts together, and compensating for wear; also, thatyielding through-bolts have been employed for uniting a pitman,sickle-head, and a spring, which permitted the bolts to yield or to drawthe parts together in compensating for wear. I am also aware thatlock-nuts are not new; and I, therefore, do not claim these partsseparately nor apart from the arrangement herein specified, in which therelation ofthe parts is such as to not only compensate for wear betweenthe parts of the hemispherical joint, while permitting a freedom ofmovement of said parts resembling in degree the action of' a universaljoint, but at the same time the spring and locking devices essential toaccommodate these movements, and to prevent their accidentaldisplacement when in use, are effectually covered and guarded from theinjurious effects incident to the exposure and out-of-door use to whichthis class of machines is necessarily subjected.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The hollow convex sicklehead B and concave pitman end or cup C', incombination with the spring D, inclosed within the hollow head B, andthe yielding through-bolt E, arranged and operating as described.

2. The feathered through-bolt E, applied to the hollow pitman-joint BC', constructed as described, in combination with the inclosed spring D,wave-washer F, and lockingnut G, all combined and operating asdescribed.

CHARLES M. YOUNG. Witnesses:

J AsoN BUDD,

SAML. B. CLARK.

